Micro-drilling resistance measurements of dense hardwoods for hydraulic structures

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Abstract

Hydraulic timber structures such as mooring poles, fenders, quay walls, lock gates and jetties are widely used in inner and marine harbours all over the world. In general, these structures give satisfactory performance with regard to the technical requirements. Because of the harsh exposure conditions such as brackish and contaminated water, drying-out and mechanical impact, the deterioration processes have to be monitored with regard to the service life performance. Visual inspection is limited to defects at the surface. Internal 'defects' such as cracks, juvenile and intermediate wood as well as biological decay influence the mechanical performance and are difficult to detect. Until now, micro-drilling technique has been successfully applied to softwoods and some medium-dense hardwoods. In this paper it has been investigated what kind of defects through the cross section of hardwood beams can be detected with the corresponding accuracy and reliability. It could be concluded that drilling resistant measurements on eucalypt and azobé allows detecting of defects such as decay and cracks, but also high and low density zones due to slow growth rates and juvenile wood areas. For this it is necessary that the micro-drilling is calibrated especially with regard to the drilling depth, the wood cross section and the wood species.
Original languageEnglish
Title of host publicationWCTE 2018 - World Conference on Timber Engineering
PublisherWorld Conference on Timber Engineering (WCTE)
Number of pages7
Publication statusPublished - 2018
EventWCTE 2018: 2018 World Conference on Timber Engineering - Seoul, Korea, Republic of
Duration: 20 Aug 201823 Aug 2018
http://wcte2018.kr

Conference

ConferenceWCTE 2018: 2018 World Conference on Timber Engineering
Abbreviated titleWCTE 2018
CountryKorea, Republic of
CitySeoul
Period20/08/1823/08/18
OtherWCTE is the world's premier forum for presenting and discussing the latest technical and architectural developments and innovations in wood or timber construction. WCTE is the most prestigious international event in timber engineering, engineered wood products and design of timber structures, which is held biennially in different parts of the world and attracts researchers, engineers and architects, code consultants and building officials, contractors and project managers, fabricators and suppliers from all continents. During WCTE 2018 the traditional focus on timber engineering and material science will be complemented by architecture related topics such as evaluation methods for green buildings and by an own platform for computer-based methods for modelling, parametric design, production, etc.
Internet address

Keywords

  • CT-scanning
  • Defects
  • High dense hardwood
  • Marine structures
  • Micro-drilling

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